QB spotlight: With starting quarterback Joe Flacco sidelined by a back injury, Ryan Mallett and Dustin Vaughan ran the offense with varying degrees of success. Mallett connected with wide receiver Breshad Perriman on a 50-yard touchdown throw-and-catch down the right sideline and showed off the arm strength to zip passes into tight windows. But he also was intercepted twice, fumbled a snap from center Ryan Jensen, and had problems on timing routes. Vaughan made a couple nice throws but threw a bad interception that was taken to the end zone.

Plenty of picks: Cornerback Maurice Canady stepped in front of a pass from Mallett that was intended for wide receiver Griff Whalen during a one-on-one drill, and rookie cornerback Jaylen Hill intercepted a pass from Mallett that bounced off wide receiver Mike Wallace's forearm during a six-on-seven red zone drill. But the best pick came from inside linebacker Kamalei Correa, whointercepted Vaughan and returned it for a touchdown. Correa then spun the ball, which was promptly booted away by running back Buck Allen.

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Matthews' catches: After sitting out last season because of a torn ligament in his thumb, wide receiver Chris Matthews got off to a solid start. He outmuscled Hill to grab a pass from Mallett, then pulled in a ball lobbed by Vaughan over cornerback Robertson Daniel before falling out of the end zone.

Urban's plays: Joining defensive tackles Brandon Williams and Michael Pierce on the first-team defense, defensive end Brent Urban tagged Mallett for a would-be sack and then blew up a stretch play to get to running back Danny Woodhead behind the line of scrimmage.

Rare miss for Tucker:Justin Tucker hit his first six field-goal attempts — including from 51 and 50 yards — and finished 9-for-10. But his seventh try clanged off the left upright. Outside linebacker Terrell Suggs pounced on the kicker, yelling: "Get it fixed! You have one [expletive] job to do!"

Name that tune: The team opened the first day of training camp by playing The Spinners' "The Rubberband Man," added Aerosmith's "Sweet Emotion" and Dustin Lynch's "Small Town Boy," and ended the session with Future's "POA."

Injury update: Flacco, running back Kenneth Dixon (torn meniscus in left knee) and free safety Tony Jefferson (sports hernia surgery) did not practice, but wide receiver Jeremy Maclin did after passing the team's conditioning test on his second attempt Thursday morning. Cornerback Jimmy Smith pulled up after chasing Perriman on a crossing route and had his right foot and ankle looked at by a trainer. He was held out of the rest of practice. Coach John Harbaugh said afterward that Smith was bothered by a cramp in his right calf. Cornerback Tavon Young (torn ACL in left knee) and wide receiver-returner Michael Campanaro (sprained toe) are on the physically unable to perform list.

Overheard at practice Part 1: Offensive line coach Joe D'Alessandris isn't one to play games. He voiced his ire to offensive tackle Stephane Nembot, saying, "Come on, Stephane, we're not waiting for you! There's no memo for you to get into your stance!"

Overheard at practice Part 2: After Mallett connected with Woodhead for a touchdown during that red zone exercise, strong safety Eric Weddle questioned whether Woodhead would have been flagged for setting a pick to get free. "Hey, Woody, that was illegal!" Weddle blurted out.